I'm having this same problem. This has happened to me before and holding down the home button and the power button for a few seconds worked before. But not anymore. Hopefully someone with some knowledge answers. I'm hoping I don't have to reset the iPad. If I need to start my own thread I will, but for now I am subscribing to this thread to see what happens. Thanks!

I'm experiencing a similar issue with everything working except for the graphic display, backlight works, power, home button, etc. I cannot figure out either. I have completed the resets both hard and soft, device is recognized in iTunes and restores successfully.

This was a purchase of 2 broken ipads, one i have working fine. I have swapped out lcd's with the working unit, I have basically narrowed the problem to the logic board, but no idea what or how to fix, short of a new logic board, which isn't really cost effective, if this ends up being the solution.